ICSE BoardEnglish MediumSTD 9PHYSICSLaws of Motion3 Marks
Question
Define absolute units of force in CGS as well as SI system.
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Answer
Absolute unit of force in CGS system is dyne and in SI system is Newton (N). One dyne: When the body of mass 1 gram moves with an acceleration of $1 cms ^{-2}$, then the force acting on the body is called one dyne. 1 dyne $=1 g cms ^{-2}$ One Newton: When a body of mass 1 kg moves with an acceleration of $1 ms^{-2}$, then force acting on the body is said to be one newton. OR That force is said to be one newton, which producers an acceleration of $1 ms^{-2}$ in a body of mass 1 kg . $1 N=1 kg ms ^{-2}$
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